SSC CHSL 7 Mar 2018 Shift 3 Paper

Diameter of driving wheel = 154 cm
⇒ Circumference (1 revolution) of wheel = $2\mathit{\pi }\mathit{r}$
= $2\times \frac{22}{7}\times 77=484$ cm
⇒ In 1 minute, the wheel covers = 4.84 m
Thus, in 1 hour, distance covered = 4.84 × 60 = 290.4 m
∴ In order to keep a speed of33 km/hr , rpm = $\frac{33}{0.2904}=113.63\approx 114$